Aeration pipe unit



FIG. 1 is a perspective view of a first embodiment of an aeration pipeunit showing our new design;

FIG. 2 is a front elevational view thereof; the rear elevational viewbeing identical thereto;

FIG. 3 is a top plan view thereof;

FIG. 4 is a right side elevational view thereof; the left sideelevational view being identical thereto;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a perspective view of a second embodiment thereof;

FIG. 7 is a front elevational view thereof; the rear elevational viewbeing identical thereto;

FIG. 8 is a top plan view thereof;

FIG. 9 is a right side elevational view thereof; the left sideelevational view being identical thereto;

FIG. 10 is a bottom plan view thereof;

FIG. 11 is a perspective view of a third embodiment thereof;

FIG. 12 is a front elevational view thereof; the rear elevational viewbeing identical thereto;

FIG. 13 is a top plan view thereof;

FIG. 14 is a right side elevational view thereof; the left sideelevational view being identical thereto; and,

FIG. 15 is a bottom plan view of the third embodiment.

The ornamental design for an aeration pipe unit, as shown and described.